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d13a21a734
Echo can interpret operand as an option and checking every variable to be echoed is troublesome while with printf, if the format specifier is present before the operand, printing as string can be enforced.
38 lines
897 B
Bash
Executable File
38 lines
897 B
Bash
Executable File
#!/bin/sh
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## SPDX-FileCopyrightText: 2023 Benjamin Grande M. S. <ben.grande.b@gmail.com>
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##
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## SPDX-License-Identifier: AGPL-3.0-or-later
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## Detect if program exists, fail otherwise.
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## With the option '-s', it prints the path to the utility that exists.
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## Usage: has program
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## Usage: has -s program alternative
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## Example: has vim
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## Example: has -s vim vim.tiny vi
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set -eu
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## The 'command' program fails to detect builtin programs.
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has_cmd="command -v"
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command -v which >/dev/null 2>&1 && has_cmd="which"
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action=""
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test -n "${1-}" || exit 1
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case "$1" in
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-s) action=show; shift; test -n "${1-}" || exit 1;;
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"") printf '%s\n' "Argument required" >&2; exit 1;;
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*) ;;
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esac
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for prog in "${@}"; do
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cmd="$(${has_cmd} "${prog}" 2>/dev/null)" || continue
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test -x "${cmd}" || continue
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case "${action-}" in
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show) printf '%s\n' "${cmd}"; exit 0;;
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*) exit 0;;
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esac
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done
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exit 1
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